This is a good place to start. If you still have any info (txid, inputs, outputs, destination address) about the transaction you tried to broadcast when sparrow hung up, it makes sense to check a block explorer for the transaction. That way you can get a sense if sparrow successfully created and signed it or if it didn't make it that far.

Don't get too worried about things. If you were able to sign and broadcast one transaction, you'll probably be able to do the rest. It doesn't sound like your btc is lost or stolen, just need to get sparrow so it can see it and sign for it.